👉 In mathematics, a pseudocroup is a structure consisting of two distinct points in a plane and an arbitrary line that passes through both. The line may be parallel or skew to the plane. For example, if you have a rectangle with vertices at (0, 0), (2, 0), (2, 3), and (0, 3), this rectangle can be considered as a pseudocroup because it has two distinct points (0, 0) and (2